Remove `Configurable#helpers` method

Simplify configurations by defining helpers by default

ee/lib/gitlab/web_ide/config/entry/global.rb

@@ -21,8 +21,6 @@ module Gitlab
           entry :terminal, Entry::Terminal,
             description: 'Configuration of the webide terminal.'
 
-          helpers :terminal
-
           attributes :terminal
         end
       end

ee/lib/gitlab/web_ide/config/entry/terminal.rb

@@ -42,8 +42,6 @@ module Gitlab
           entry :variables, ::Gitlab::Ci::Config::Entry::Variables,
             description: 'Environment variables available for this job.'
 
-          helpers :before_script, :script, :image, :variables, :services
-
           attributes :tags
 
           def value

lib/gitlab/ci/config/entry/artifacts.rb

@@ -44,8 +44,6 @@ module Gitlab
             end
           end
 
-          helpers :reports
-
           def value
             @config[:reports] = reports_value if @config.key?(:reports)
             @config

lib/gitlab/ci/config/entry/bridge.rb

@@ -49,8 +49,6 @@ module Gitlab
             description: 'Environment variables available for this job.',
             inherit: false
 
-          helpers :trigger, :needs, :variables
-
           attributes :when, :allow_failure
 
           def self.matching?(name, config)

lib/gitlab/ci/config/entry/cache.rb

@@ -28,8 +28,6 @@ module Gitlab
           entry :paths, Entry::Paths,
             description: 'Specify which paths should be cached across builds.'
 
-          helpers :key
-
           attributes :policy
 
           def value

lib/gitlab/ci/config/entry/default.rb

@@ -61,8 +61,6 @@ module Gitlab
             description: 'Default artifacts.',
             inherit: false
 
-          helpers :before_script, :image, :services, :after_script, :cache
-
           private
 
           def overwrite_entry(deps, key, current_entry)

lib/gitlab/ci/config/entry/job.rb

@@ -128,11 +128,6 @@ module Gitlab
             description: 'This job will produce a release.',
             inherit: false
 
-          helpers :before_script, :script, :type, :after_script,
-                  :cache, :image, :services, :variables,
-                  :artifacts, :environment, :coverage, :retry,
-                  :needs, :interruptible, :release, :tags
-
           attributes :script, :tags, :allow_failure, :when, :dependencies,
                      :needs, :retry, :parallel, :start_in,
                      :interruptible, :timeout, :resource_group, :release

lib/gitlab/ci/config/entry/processable.rb

@@ -54,8 +54,6 @@ module Gitlab
                 allowed_when: %w[on_success on_failure always never manual delayed].freeze
               }
 
-            helpers :stage, :only, :except, :rules
-
             attributes :extends, :rules
           end
 

lib/gitlab/ci/config/entry/release.rb

@@ -33,8 +33,6 @@ module Gitlab
             validates :description, type: String, presence: true
           end
 
-          helpers :assets
-
           def value
             @config[:assets] = assets_value if @config.key?(:assets)
             @config

lib/gitlab/ci/config/entry/release/assets.rb

@@ -23,8 +23,6 @@ module Gitlab
               validates :links, array_of_hashes: true, presence: true
             end
 
-            helpers :links
-
             def value
               @config[:links] = links_value if @config.key?(:links)
               @config

lib/gitlab/ci/config/entry/root.rb

@@ -67,9 +67,7 @@ module Gitlab
           entry :workflow, Entry::Workflow,
             description: 'List of evaluable rules to determine Pipeline status'
 
-          helpers :default, :stages, :types, :variables, :workflow
-
-          helpers :jobs, dynamic: true
+          dynamic_helpers :jobs
 
           delegate :before_script_value,
                    :image_value,

lib/gitlab/ci/config/entry/service.rb

@@ -7,8 +7,13 @@ module Gitlab
         ##
         # Entry that represents a configuration of Docker service.
         #
-        class Service < Image
+        # TODO: remove duplication with Image superclass by defining a common
+        # Imageable concern.
+        # https://gitlab.com/gitlab-org/gitlab/issues/208774
+        class Service < ::Gitlab::Config::Entry::Node
           include ::Gitlab::Config::Entry::Validatable
+          include ::Gitlab::Config::Entry::Attributable
+          include ::Gitlab::Config::Entry::Configurable
 
           ALLOWED_KEYS = %i[name entrypoint command alias ports].freeze
 
@@ -16,9 +21,9 @@ module Gitlab
             validates :config, hash_or_string: true
             validates :config, allowed_keys: ALLOWED_KEYS
             validates :config, disallowed_keys: %i[ports], unless: :with_image_ports?
-
             validates :name, type: String, presence: true
             validates :entrypoint, array_of_strings: true, allow_nil: true
+
             validates :command, array_of_strings: true, allow_nil: true
             validates :alias, type: String, allow_nil: true
             validates :alias, type: String, presence: true, unless: ->(record) { record.ports.blank? }
@@ -27,6 +32,8 @@ module Gitlab
           entry :ports, Entry::Ports,
             description: 'Ports used to expose the service'
 
+          attributes :ports
+
           def alias
             value[:alias]
           end
@@ -34,6 +41,29 @@ module Gitlab
           def command
             value[:command]
           end
+
+          def name
+            value[:name]
+          end
+
+          def entrypoint
+            value[:entrypoint]
+          end
+
+          def value
+            return { name: @config } if string?
+            return @config if hash?
+
+            {}
+          end
+
+          def with_image_ports?
+            opt(:with_image_ports)
+          end
+
+          def skip_config_hash_validation?
+            true
+          end
         end
       end
     end

lib/gitlab/config/entry/configurable.rb

@@ -75,7 +75,8 @@ module Gitlab
 
           # rubocop: disable CodeReuse/ActiveRecord
           def entry(key, entry, description: nil, default: nil, inherit: nil, reserved: nil, metadata: {})
-            raise ArgumentError, "Entry #{key} already defined" if @nodes.to_h[key.to_sym]
+            entry_name = key.to_sym
+            raise ArgumentError, "Entry #{key} already defined" if @nodes.to_h[entry_name]
 
             factory = ::Gitlab::Config::Entry::Factory.new(entry)
               .with(description: description)
@@ -84,10 +85,17 @@ module Gitlab
               .with(reserved: reserved)
               .metadata(metadata)
 
-            (@nodes ||= {}).merge!(key.to_sym => factory)
+            @nodes ||= {}
+            @nodes[entry_name] = factory
+
+            helpers(entry_name)
           end
           # rubocop: enable CodeReuse/ActiveRecord
 
+          def dynamic_helpers(*nodes)
+            helpers(*nodes, dynamic: true)
+          end
+
           def helpers(*nodes, dynamic: false)
             nodes.each do |symbol|
               if method_defined?("#{symbol}_defined?") || method_defined?("#{symbol}_value")